Malicious PDF — malware analysis report

Static analysis result for SHA-256 702c88d3162af66e…

MALICIOUS

PDF

79.0 KB Created: 2021-05-31 15:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d711fb704e0dd436d3ab9009532fce54 SHA-1: 72adfea308ff043a7b0443943686b9edfee2778a SHA-256: 702c88d3162af66e170eabda35c86061782466a95f28c5b9c00389a7208a9078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a PDF SEO link farm. One of the primary links, https://vilenefex.ru/strik, appears to be a malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=where+is+hawkwood+summon+sign
    • https://tijanowu.weebly.com/uploads/1/3/0/7/130739502/pusesufadezolifeme.pdf
    • https://pefipufipukota.weebly.com/uploads/1/3/4/0/134042651/pozilemezatirufixi.pdf
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/6339312.pdf
    • https://lidoporovumo.weebly.com/uploads/1/3/4/5/134506542/8271507.pdf
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6057dc01a9a73.pdf
    • https://cdn-cms.f-static.net/uploads/4403948/normal_60378746ca23a.pdf
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/5685405.pdf
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5fff72afa601f.pdf
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5fd7d3585627c.pdf
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/2857636.pdf
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/mugusagapikuw_zadogijo_gifud.pdf
    • https://static.s123-cdn-static.com/uploads/4409796/normal_5ff34824ba2e9.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd7efe8eb787.pdf
    • https://javewadeje.weebly.com/uploads/1/3/4/8/134882586/pigej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad67c67a-274a-4aeb-a1db-d4e1dece6786/bubixenikorik.pdf
    • https://uploads.strikinglycdn.com/files/ad850570-700e-421b-bbae-381151d20b18/why_samsung_refrigerator_not_making_ice.pdf
    • https://uploads.strikinglycdn.com/files/81cbf554-802e-4e1b-9371-61d88898bd3f/zofuwefumefujo.pdf
    • https://uploads.strikinglycdn.com/files/8d424d2e-3615-4f14-92a8-8d17a77eaf33/wazaruje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61f.bin
47e8edb6b3da9dcf887df98b15b70f9ca6b106fee059f0b1b865e0f3cedd8988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 5376 bytes
font_01_sfnt_off00010856.bin
cedb33b3da380806f36ea31d17960c5cb83140b0ed37b3ab5192154ef9d19eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 11552 bytes

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